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#[macro_use]
extern crate anyhow;
use anyhow::Result;
use blake2::{Blake2b, Digest};
use rusqlite::{params, Connection};
use std::io;
use std::path::Path;
/// Return a hex-encoded string representing the contents of `hash`.
fn hexlify(hash: &[u8]) -> String {
hash.iter()
.map(|b| format!("{:x}", b))
.collect::<Vec<String>>()
.join("")
}
#[derive(Debug)]
struct TagBase {
conn: Connection,
}
fn hash_file(path: &Path) -> Result<String> {
let mut file = std::fs::File::open(path)?;
let mut hasher = Blake2b::new();
let _ = io::copy(&mut file, &mut hasher)?;
Ok(base64::encode(&hasher.result()))
}
impl TagBase {
/// Instantiate a new `TagBase` whose backing database is at `path`.
pub fn new(path: &str) -> Result<Self> {
let tb = TagBase {
conn: Connection::open(path)?,
};
tb.initialize_tables()?;
Ok(tb)
}
fn make_temporary() -> Result<Self> {
let tb = TagBase {
conn: Connection::open_in_memory()?,
};
tb.initialize_tables()?;
Ok(tb)
}
/// Create the table structure for the tag database.
fn initialize_tables(&self) -> Result<()> {
self.conn.execute(
"CREATE TABLE IF NOT EXISTS images (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
blake2 TEXT NOT NULL,
filename TEXT NOT NULL,
orig_dir TEXT NOT NULL
)",
params![],
)?;
self.conn.execute(
"CREATE TABLE IF NOT EXISTS tags (
id INTEGER NOT NULL PRIMARY KEY AUTOINCREMENT,
name TEXT NOT NULL
)",
params![],
)?;
self.conn.execute(
"CREATE TABLE IF NOT EXISTS mapping (
image INTEGER NOT NULL,
tag INTEGER NOT NULL
)",
params![],
)?;
Ok(())
}
/// Insert the image at `path` into the data.
fn import_image(&self, path: &Path) -> Result<i64> {
if path.is_dir() {
bail!("`path` does not name a file.");
}
let hash = hash_file(path)?;
let file_name = path
.file_name()
.and_then(|os| os.to_str())
.ok_or(anyhow!("Couldn't parse file name."))?;
let path = path.to_str().ok_or(anyhow!("Couldn't parse path."))?;
let split_index = path.len() - file_name.len();
let parent_directory = &path[0..split_index];
let id = self
.conn
.prepare("INSERT INTO images (blake2, filename, orig_dir) VALUES(?,?,?)")?
.insert(params![hash, file_name, parent_directory])?;
Ok(id)
}
/// Insert `tag` into the database, if it does not already exist.
fn add_tag(&self, tag: &str) -> Result<()> {
let exists = self
.conn
.prepare("SELECT * FROM tags WHERE name = ?")?
.exists(params![tag]);
if let Err(_) = exists {
self.conn
.execute("INSERT INTO tags (name) VALUES(?)", params![tag])?;
}
Ok(())
}
/// Associate `tag` with the image specified by `image_id`.
fn tag_image(&self, image_id: i64, tag: &str) -> Result<()> {
let tag_id: i64 = self
.conn
.prepare("SELECT * FROM tags WHERE name = ?")?
.query_row(params![tag], |row| Ok(row.get(0)))??;
self.conn.execute(
"INSERT INTO mapping (image, tag) VALUES(?, ?)",
params![image_id, tag_id],
)?;
Ok(())
}
fn tags_for_image(&self, image_id: i64) -> Result<Vec<String>> {
Ok(self
.conn
.prepare(
"SELECT tags.name, COUNT(mapping.tag) as tag_count
FROM mapping
INNER JOIN images ON images.id = ?
INNER JOIN tags
GROUP BY tags.name",
)?
.query_map(params![image_id], |row| row.get(0))?
.filter_map(|tag| tag.ok())
.collect())
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn tables_exist() {
let tb = TagBase::make_temporary().unwrap();
for table in ["images", "tags", "mapping"].iter() {
let exists = tb
.conn
.prepare("SELECT name FROM sqlite_master WHERE type='table' AND name=?;")
.unwrap()
.exists(params![table])
.unwrap();
if !exists {
panic!("Table {} did not exist", table);
}
}
}
}
fn main() {
let tb = TagBase::new("/tmp/test.db").unwrap();
tb.import_image(Path::new("/home/jakob/Sync/06fc9ae71549eb4d.jpeg"))
.unwrap();
println!("{:?}", tb);
}
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